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Alarm device having integrated battery

  • US 5,774,044 A
  • Filed: 12/11/1996
  • Issued: 06/30/1998
  • Est. Priority Date: 12/12/1995
  • Status: Expired due to Fees
First Claim
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1. An anti-theft system for a vehicle including a vehicle battery, an ignition key switch, a sensor for detecting access to a compartment of said vehicle, a control unit connected to said ignition switch and said access-detecting sensor for determining whether or not said system is on the watch and an alarm device connected to said vehicle battery and said control unit, wherein said alarm device comprises:

  • an integrated auxiliary battery;

    an alarming-sound generator for sounding when energized;

    a disconnection-detecting unit for detecting disconnection of said alarm device from said vehicle battery;

    a driving unit, connected to said disconnection-detecting unit and to said control unit, for activating said alarming-sound generator when said driving unit is supplied with power; and

    power supplying means, connected to said auxiliary battery and said driving unit, for supplying power from said auxiliary battery to said driving unit when said control unit determines that said system is on the watch and said disconnection-detecting unit detects a disconnection of said alarm device from said vehicle battery, whereinsaid supplying means cuts power supplied to said driving unit when said control unit determines that said system is not on the watch, regardless of whether or not said disconnection-detecting unit detects a disconnection.

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